[{"id":3674195,"web_url":"http://patchwork.ozlabs.org/comment/3674195/","msgid":"<00c04913-5549-4b08-b007-fe06712dddac@canonical.com>","list_archive_url":null,"date":"2026-04-07T13:53:55","subject":"CMNT Re: [SRU][Q][PATCH 0/2] On Dell system, the internal OLED\n display drops to a visibly low FPS after suspend/resume","submitter":{"id":66462,"url":"http://patchwork.ozlabs.org/api/people/66462/","name":"Timo Aaltonen","email":"timo.aaltonen@canonical.com"},"content":"AceLan Kao kirjoitti 7.4.2026 klo 5.50:\n> From: \"Chia-Lin Kao (AceLan)\" \n> \n> BugLink: https://bugs.launchpad.net/bugs/2144712\n> \n> [Impact]\n> On Dell systems (CID: 202511-38076), the internal OLED display drops to a\n> visibly lower refresh rate after suspend/resume. The state persists until a\n> cold reboot. Applications like glmark2 still report rendering at 120Hz but\n> the panel visually operates at a much lower frame rate.\n> \n> Steps to reproduce:\n> 1. Unplug all accessories\n> 2. Boot into OS\n> 3. Drag a window around the desktop and observe the FPS (smooth 120Hz)\n> 4. Suspend then resume\n> 5. Drag a window around the desktop — FPS is now visibly and permanently lower\n> Failure rate: 100% on affected hardware\n> Affected test case: com.canonical.certification::suspend/display_after_suspend\n> \n> Root cause: The i915 driver initializes Panel Replay (an OLED power-saving\n> feature) via DPCD negotiation during resume. On this specific panel, Panel\n> Replay causes the display to be locked at a degraded frame rate after resume.\n> The panel does not correctly handle Panel Replay activation in this\n> configuration, resulting in permanently reduced FPS until a cold reboot.\n> \n> [Fix]\n> Add a new quirk QUIRK_DISABLE_PANEL_REPLAY to the Intel i915 display driver\n> that prevents Panel Replay DPCD initialization for problematic panel setups.\n> Apply this quirk for Dell systems with device ID 0xb080, subsystem vendor\n> 0x1028, subsystem device 0x0db9, and sink OUI 0x00:0x22:0xb9.\n> \n> When the quirk is present, _panel_replay_init_dpcd() returns early before\n> reading Panel Replay capability from the panel's DPCD registers, effectively\n> disabling the Panel Replay feature for this hardware combination.\n> \n> The patch is currently under review in the Intel DRM/i915 mailing list:\n> https://patchwork.freedesktop.org/series/163265/\n> \n> Upstream issue tracker:\n> https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/7521\n> \n> In linux-next\n> 1de647abdfda9 drm/i915/psr: Fixes for Dell XPS DA14260 quirk\n> 45c77d4bf8d4d drm/i915/psr: Disable Panel Replay on Dell XPS 14 DA14260 as a quirk\n> \n> [Test Plan]\n> On a Dell system (CID: 202511-38076) with Intel integrated graphics:\n> \n> 1. Suspend and resume the system:\n> $ sudo rtcwake -m mem -s 20\n> 2. After resume, drag a window around the desktop and observe the frame rate.\n> \n> Without the patch: The display FPS drops permanently after resume and stays\n> degraded until cold reboot.\n> With the patch: The display maintains normal 120Hz refresh rate after\n> suspend/resume.\n> \n> [Where problems could occur]\n> It may break Panel Replay functionality on Intel i915 display configurations.\n> \n> The quirk check is inserted early in _panel_replay_init_dpcd(), before any\n> DPCD reads occur. If the quirk match logic incorrectly identifies a panel\n> (e.g., due to incorrect OUI or PCI subsystem ID matching), Panel Replay will\n> be silently disabled on panels where it would otherwise work correctly. This\n> would cause affected systems to lose the power-saving benefits of Panel Replay\n> without any visible error — users would see slightly higher power consumption\n> on OLED panels.\n> \n> Additionally, if the quirk infrastructure itself has a bug (e.g., the\n> intel_has_dpcd_quirk() function returning unexpected values), it could either\n> fail to disable Panel Replay on affected hardware (regression still present)\n> or disable it too broadly on unaffected hardware.\n> \n> [Other Info]\n> The patch is under review in the Intel DRM mailing list (patchwork series\n> 163265) and has not yet landed in the mainline kernel.\n> \n> Jouni Högander (2):\n> drm/i915/psr: Disable Panel Replay on Dell XPS 14 DA14260 as a quirk\n> drm/i915/psr: Fixes for Dell XPS DA14260 quirk\n> \n> drivers/gpu/drm/i915/display/intel_psr.c | 8 +++++++\n> drivers/gpu/drm/i915/display/intel_quirks.c | 25 ++++++++++++++++++---\n> drivers/gpu/drm/i915/display/intel_quirks.h | 1 +\n> 3 files changed, 31 insertions(+), 3 deletions(-)\n> \n\nNote that you used the old bug for both of these, so the new bug \n(2145172) is redundant?","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=Dkii1KxS;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fqnjs5p80z1xy1\n\tfor ; Tue, 07 Apr 2026 23:54:09 +1000 (AEST)","from localhost ([127.0.0.1] helo=lists.ubuntu.com)\n\tby lists.ubuntu.com with esmtp (Exim 4.86_2)\n\t(envelope-from )\n\tid 1wA6sR-0004Ch-9r; Tue, 07 Apr 2026 13:53:59 +0000","from smtp-relay-internal-1.internal ([10.131.114.114]\n helo=smtp-relay-internal-1.canonical.com)\n by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.86_2) (envelope-from )\n id 1wA6sQ-0004CX-3s\n for kernel-team@lists.ubuntu.com; Tue, 07 Apr 2026 13:53:58 +0000","from mail-lf1-f72.google.com (mail-lf1-f72.google.com\n [209.85.167.72])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id F2AC33F29C\n for ; Tue, 7 Apr 2026 13:53:57 +0000 (UTC)","by mail-lf1-f72.google.com with SMTP id\n 2adb3069b0e04-5a2c987df7cso3470240e87.2\n for ; Tue, 07 Apr 2026 06:53:57 -0700 (PDT)","from [10.10.10.204] (46-254-212-58.localnetip.fi. 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The state persists until a\n> > cold reboot. Applications like glmark2 still report rendering at 120Hz but\n> > the panel visually operates at a much lower frame rate.\n> >\n> > Steps to reproduce:\n> > 1. Unplug all accessories\n> > 2. Boot into OS\n> > 3. Drag a window around the desktop and observe the FPS (smooth 120Hz)\n> > 4. Suspend then resume\n> > 5. Drag a window around the desktop — FPS is now visibly and permanently lower\n> > Failure rate: 100% on affected hardware\n> > Affected test case: com.canonical.certification::suspend/display_after_suspend\n> >\n> > Root cause: The i915 driver initializes Panel Replay (an OLED power-saving\n> > feature) via DPCD negotiation during resume. On this specific panel, Panel\n> > Replay causes the display to be locked at a degraded frame rate after resume.\n> > The panel does not correctly handle Panel Replay activation in this\n> > configuration, resulting in permanently reduced FPS until a cold reboot.\n> >\n> > [Fix]\n> > Add a new quirk QUIRK_DISABLE_PANEL_REPLAY to the Intel i915 display driver\n> > that prevents Panel Replay DPCD initialization for problematic panel setups.\n> > Apply this quirk for Dell systems with device ID 0xb080, subsystem vendor\n> > 0x1028, subsystem device 0x0db9, and sink OUI 0x00:0x22:0xb9.\n> >\n> > When the quirk is present, _panel_replay_init_dpcd() returns early before\n> > reading Panel Replay capability from the panel's DPCD registers, effectively\n> > disabling the Panel Replay feature for this hardware combination.\n> >\n> > The patch is currently under review in the Intel DRM/i915 mailing list:\n> > https://patchwork.freedesktop.org/series/163265/\n> >\n> > Upstream issue tracker:\n> > https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/7521\n> >\n> > In linux-next\n> > 1de647abdfda9 drm/i915/psr: Fixes for Dell XPS DA14260 quirk\n> > 45c77d4bf8d4d drm/i915/psr: Disable Panel Replay on Dell XPS 14 DA14260 as a quirk\n> >\n> > [Test Plan]\n> > On a Dell system (CID: 202511-38076) with Intel integrated graphics:\n> >\n> > 1. Suspend and resume the system:\n> > $ sudo rtcwake -m mem -s 20\n> > 2. After resume, drag a window around the desktop and observe the frame rate.\n> >\n> > Without the patch: The display FPS drops permanently after resume and stays\n> > degraded until cold reboot.\n> > With the patch: The display maintains normal 120Hz refresh rate after\n> > suspend/resume.\n> >\n> > [Where problems could occur]\n> > It may break Panel Replay functionality on Intel i915 display configurations.\n> >\n> > The quirk check is inserted early in _panel_replay_init_dpcd(), before any\n> > DPCD reads occur. If the quirk match logic incorrectly identifies a panel\n> > (e.g., due to incorrect OUI or PCI subsystem ID matching), Panel Replay will\n> > be silently disabled on panels where it would otherwise work correctly. This\n> > would cause affected systems to lose the power-saving benefits of Panel Replay\n> > without any visible error — users would see slightly higher power consumption\n> > on OLED panels.\n> >\n> > Additionally, if the quirk infrastructure itself has a bug (e.g., the\n> > intel_has_dpcd_quirk() function returning unexpected values), it could either\n> > fail to disable Panel Replay on affected hardware (regression still present)\n> > or disable it too broadly on unaffected hardware.\n> >\n> > [Other Info]\n> > The patch is under review in the Intel DRM mailing list (patchwork series\n> > 163265) and has not yet landed in the mainline kernel.\n> >\n> > Jouni Högander (2):\n> > drm/i915/psr: Disable Panel Replay on Dell XPS 14 DA14260 as a quirk\n> > drm/i915/psr: Fixes for Dell XPS DA14260 quirk\n> >\n> > drivers/gpu/drm/i915/display/intel_psr.c | 8 +++++++\n> > drivers/gpu/drm/i915/display/intel_quirks.c | 25 ++++++++++++++++++---\n> > drivers/gpu/drm/i915/display/intel_quirks.h | 1 +\n> > 3 files changed, 31 insertions(+), 3 deletions(-)\n> >\n>\n> Note that you used the old bug for both of these, so the new bug (2145172)\n> is redundant?\nYou are right, I forgot there is a new bug for the second patch.\nLet me address the SRU submission on the new bug and mark it as\nduplicated.\n\n>\n>\n> --\n> Timo Aaltonen\n> Kernel Team\n> Canonical Ltd.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=fTmbFLeQ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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