[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Bug Watch Updater]

** Changed in: xserver-xorg-video-intel
   Status: Incomplete => Invalid

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Bug Watch Updater]

** Changed in: xserver-xorg-video-intel
   Status: Confirmed => Incomplete

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

** Bug watch added: freedesktop.org Bugzilla #92457
   https://bugs.freedesktop.org/show_bug.cgi?id=92457

** Also affects: xserver-xorg-video-intel via
   https://bugs.freedesktop.org/show_bug.cgi?id=92457
   Importance: Unknown
   Status: Unknown

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Bug Watch Updater]

Launchpad has imported 2 comments from the remote bug at
https://bugs.freedesktop.org/show_bug.cgi?id=92457.

If you reply to an imported comment from within Launchpad, your comment
will be sent to the remote bug automatically. Read more about
Launchpad's inter-bugtracker facilities at
https://help.launchpad.net/InterBugTracking.


On 2015-10-14T09:40:09+00:00 Robert Ancell wrote:

On Intel systems when the X server exits the display is turned off and
remains off. This is triggered when using LightDM and switching to a
greeter (starts a second X server) then authenticating in that greeter
and returning to the first X server (the greeter X server is stopped).

The cause seems to be a DPMS change from bug 90179 (revision
7d9a74622e5a936e4860fcef8358619bf59adae8) that causes the driver to turn
off the output if DPMS is not working.

Tracked in Launchpad:
https://bugs.launchpad.net/bugs/1501941

Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1501941/comments/10


On 2015-10-14T09:40:40+00:00 Robert Ancell wrote:

We are currently working around this issue in Ubuntu 15.04 by reverting
that one commmit.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1501941/comments/11


** Changed in: xserver-xorg-video-intel
   Status: Unknown => Confirmed

** Changed in: xserver-xorg-video-intel
   Importance: Unknown => Medium

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Jean-Baptiste Lallement]

I tried the patched version from the PPA and it fixes the problem for
me. No more black screen after restarting lightdm

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

I've uploaded this change to wily. There is a possibility that there
might be a regression for some users with DPMS but I think that is less
severe than the effect on those who are left with the screen off. We'll
look at doing an update if upstream provides a fix.

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Status: Triaged => Fix Committed

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Launchpad Bug Tracker]

This bug was fixed in the package xserver-xorg-video-intel -
2:2.99.917+git20150808-0ubuntu3

---
xserver-xorg-video-intel (2:2.99.917+git20150808-0ubuntu3) wily; urgency=medium

  * debian/patches/revert-dpms-fix.patch:
- Revert a DPMS change that causes the screen to turn off when returning
  from a greeter (LP: #1501941)

 -- Robert Ancell   Tue, 06 Oct 2015
14:25:00 +1300

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Status: Fix Committed => Fix Released

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Michał Sawicz]

Confirmed, this is the exact problem I'm having here.

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  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

I am bisecting the problem...

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  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

I first noticed this occuring sometime around the end of August.

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Title:
  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

The issue is in git master and bisecting shows it to be this commit:

commit 7d9a74622e5a936e4860fcef8358619bf59adae8
Author: Chris Wilson 
Date:   Mon Jun 15 14:16:34 2015 +0100

sna: Be robust in handling DPMS failures

If we fail to turn off an output via DPMS, disable the entire CRTC in
order to blank the output and save the screeen/power.

Reported-by: Lukas Hejtmanek  
References: https://bugs.freedesktop.org/show_bug.cgi?id=90179
Signed-off-by: Chris Wilson 

diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index f58eb8d..efc5fc9 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -213,7 +213,7 @@ struct sna_output {
int panel_vdisplay;
 
uint32_t dpms_id;
-   int dpms_mode;
+   uint8_t dpms_mode;
struct backlight backlight;
int backlight_active_level;
 
@@ -251,6 +251,7 @@ enum { /* XXX copied from hw/xfree86/modes/xf86Crtc.c */
OPTION_DEFAULT_MODES,
 };
 
+static void __sna_output_dpms(xf86OutputPtr output, int dpms, int fixup);
 static void sna_crtc_disable_cursor(struct sna *sna, struct sna_crtc *crtc);
 
 static bool is_zaphod(ScrnInfoPtr scrn)
@@ -936,7 +937,7 @@ sna_crtc_force_outputs_on(xf86CrtcPtr crtc)
if (output->crtc != crtc)
continue;
 
-   output->funcs->dpms(output, DPMSModeOn);
+   __sna_output_dpms(output, DPMSModeOn, false);
}
 
 #if XF86_CRTC_VERSION >= 3
@@ -966,7 +967,7 @@ sna_crtc_force_outputs_off(xf86CrtcPtr crtc)
if (output->crtc != crtc)
continue;
 
-   output->funcs->dpms(output, DPMSModeOff);
+   __sna_output_dpms(output, DPMSModeOff, false);
}
 }
 
@@ -1099,7 +1100,7 @@ sna_crtc_apply(xf86CrtcPtr crtc)
 * and we lose track of the user settings.
 */
if (output->crtc == NULL)
-   output->funcs->dpms(output, DPMSModeOff);
+   __sna_output_dpms(output, DPMSModeOff, false);
 
if (output->crtc != crtc)
continue;
@@ -3580,7 +3581,7 @@ sna_output_destroy(xf86OutputPtr output)
 }
 
 static void
-sna_output_dpms(xf86OutputPtr output, int dpms)
+__sna_output_dpms(xf86OutputPtr output, int dpms, int fixup)
 {
struct sna *sna = to_sna(output->scrn);
struct sna_output *sna_output = output->driver_private;
@@ -3607,8 +3608,9 @@ sna_output_dpms(xf86OutputPtr output, int dpms)
if (sna_output->backlight.iface && dpms != DPMSModeOn) {
if (old_dpms == DPMSModeOn) {
sna_output->backlight_active_level = 
sna_output_backlight_get(output);
-   DBG(("%s: saving current backlight %d\n",
-__FUNCTION__, sna_output->backlight_active_level));
+   DBG(("%s(%s:%d): saving current backlight %d\n",
+__FUNCTION__, output->name, sna_output->id,
+sna_output->backlight_active_level));
}
sna_output->dpms_mode = dpms;
sna_output_backlight_off(sna_output);
@@ -3618,18 +3620,31 @@ sna_output_dpms(xf86OutputPtr output, int dpms)
drmModeConnectorSetProperty(sna->kgem.fd,
sna_output->id,
sna_output->dpms_id,
-   dpms))
-   dpms = old_dpms;
+   dpms)) {
+   DBG(("%s(%s:%d): failed to set DPMS to %d (fixup? %d)\n",
+__FUNCTION__, output->name, sna_output->id, dpms, fixup));
+   if (fixup) {
+   sna_crtc_disable(output->crtc, false);
+   return;
+   }
+   }
 
if (sna_output->backlight.iface && dpms == DPMSModeOn) {
-   DBG(("%s: restoring previous backlight %d\n",
-__FUNCTION__, sna_output->backlight_active_level));
+   DBG(("%s(%d:%d: restoring previous backlight %d\n",
+__FUNCTION__, output->name, sna_output->id,
+sna_output->backlight_active_level));
sna_output_backlight_on(sna_output);
}
 
sna_output->dpms_mode = dpms;
 }
 
+static void
+sna_output_dpms(xf86OutputPtr output, int dpms)
+{
+   __sna_output_dpms(output, dpms, true);
+}
+
 static bool
 sna_property_ignore(drmModePropertyPtr prop)
 {
@@ -4438,10 +4453,8 @@ reset:
sna_output->dpms_mode = sna_output->prop_values[i];
DBG(("%s: found 'DPMS' (idx=%d, id=%d), initial value=%d\n",
 __FUNCTION__, i, sna_output->dpms_id, 
sna_output->dpms_mode));
-   } else {
-   sna_output->dpms_id = -1;
+   } else

[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Status: New => Triaged

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Importance: Undecided => High

** Changed in: xserver-xorg-video-intel (Ubuntu)
 Assignee: (unassigned) => Robert Ancell (robert-ancell)

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  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

I've put a patched version of the Intel driver in ppa:robert-ancell/xorg
[1]. I think the change might cause a DPMS regression as described in
the upstream bug so it probably should get some more testing before
uploading.

[1] https://launchpad.net/~robert-ancell/+archive/ubuntu/xorg

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  Screen turned off after X server exits

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[Ubuntu-x-swat] [Bug 1501941] Re: Screen turned off after X server exits

[Robert Ancell]

https://bugs.freedesktop.org/show_bug.cgi?id=90179 was the reason for
this commit.

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  Screen turned off after X server exits

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