linux-kernel - Re: 6.1.23: 0fc6fea41c71 breaks GPD Pocket 3 modeset

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Message-ID: <ZFEMkypQy1I4vprK@intel.com>
Date:   Tue, 2 May 2023 16:13:55 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Kurt Garloff <kurt@...loff.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org
Subject: Re: 6.1.23: 0fc6fea41c71 breaks GPD Pocket 3 modeset

On Sat, Apr 29, 2023 at 09:55:45PM +0200, Kurt Garloff wrote:
> Hi Ville,
> 
> While
> 0fc6fea41c71 drm/i915: Disable DC states for all commits
> (cherry picked from commit 41b4c7fe72b6105a4b49395eea9aa40cef94288d)
> does look correct to me, it does break modesetting on the GPD Pocket 3,
> a i7-1195G7 laptop. I run the kernel with
> fbcon=rotate:1 video=DSI-1:panel_orientation=right_side_up \
> mem_sleep_default=s2idle
> No special i915 parameters.
> Hardware is described here:
> https://wiki.archlinux.org/title/GPD_Pocket_3
> 
> I disected this patch which was merged (backported) for 6.1.23.
> I currently run 6.1.26 with it reverted.
> 
> Without reverting it, when fbcon is switched to show the splash
> screen (GPD logo with Ubuntu added in on working kernels), the
> screen remains black (backlight on, but nothing displayed) and
> nothing happens any more.

Please file a bug at
https://gitlab.freedesktop.org/drm/intel/issues/new

Boot both kernels (revert vs. no revert), passing
'drm.debug=0xe log_buf_len=4M' to the kernel cmdline,
and attach the resulting dmesg from each to the bug.

Also would be good if you try to reproduce on the
latest drm-tip (git://anongit.freedesktop.org/drm-tip drm-tip)
as well.

-- 
Ville Syrjälä
Intel