This is a note to let you know that I've just added the patch titled
drm: Fix broken VT switch with video=1366x768 option
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-fix-broken-vt-switch-with-video-1366x768-option.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fdf35a6b22247746a7053fc764d04218a9306f82 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Mon, 9 Jan 2017 15:56:14 +0100
Subject: drm: Fix broken VT switch with video=1366x768 option
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From: Takashi Iwai <tiwai@xxxxxxx>
commit fdf35a6b22247746a7053fc764d04218a9306f82 upstream.
I noticed that the VT switch doesn't work any longer with a Dell
laptop with 1366x768 eDP when the machine is connected with a DP
monitor. It behaves as if VT were switched, but the graphics remain
frozen. Actually the keyboard works, so I could switch back to VT7
again.
I tried to track down the problem, and encountered a long story until
we reach to this error:
- The machine is booted with video=1366x768 option (the distro
installer seems to add it as default).
- Recently, drm_helper_probe_single_connector_modes() deals with
cmdline modes, and it tries to create a new mode when no
matching mode is found.
- The drm_mode_create_from_cmdline_mode() creates a mode based on
either CVT of GFT according to the given cmdline mode; in our case,
it's 1366x768.
- Since both CVT and GFT can't express the width 1366 due to
alignment, the resultant mode becomes 1368x768, slightly larger than
the given size.
- Later on, the atomic commit is performed, and in
drm_atomic_check_only(), the size of each plane is checked.
- The size check of 1366x768 fails due to the above, and eventually
the whole VT switch fails.
Back in the history, we've had a manual fix-up of 1368x768 in various
places via c09dedb7a50e ("drm/edid: Add a workaround for 1366x768 HD
panel"), but they have been all in drm_edid.c at probing the modes
from EDID. For addressing the problem above, we need a similar hack
to the mode newly created from cmdline, manually adjusting the width
when the expected size is 1366 while we get 1368 instead.
Fixes: eaf99c749d43 ("drm: Perform cmdline mode parsing during...")
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20170109145614.29454-1-tiwai@xxxxxxx
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_modes.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1401,6 +1401,13 @@ drm_mode_create_from_cmdline_mode(struct
return NULL;
mode->type |= DRM_MODE_TYPE_USERDEF;
+ /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
+ if (cmd->xres == 1366 && mode->hdisplay == 1368) {
+ mode->hdisplay = 1366;
+ mode->hsync_start--;
+ mode->hsync_end--;
+ drm_mode_set_name(mode);
+ }
drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
return mode;
}
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-4.4/drm-fix-broken-vt-switch-with-video-1366x768-option.patch
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