Bug 96551 - VGA black screen
Summary: VGA black screen
Status: RESOLVED OBSOLETE
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: Intel Linux
: P1 high
Assignee: intel-gfx-bugs@lists.freedesktop.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-04-13 02:54 UTC by saiveny
Modified: 2015-10-07 10:10 UTC (History)
1 user (show)

See Also:
Kernel Version: 3.14.33
Subsystem:
Regression: No
Bisected commit-id:

Attachments
dmesg log (36.14 KB, text/x-log)
2015-04-13 02:54 UTC, saiveny 		Details
Add an attachment (proposed patch, testcase, etc.)

Description saiveny 2015-04-13 02:54:25 UTC 
Created attachment 173801 [details]
dmesg log

I have a issue with VGA black screen but mouse cursor exists when switch Display to VGA only.
    
    Environment :
        CPU : Intel(R) Celeron(R) CPU N2807 @ 1.58GHz
        OS : Base on Ubuntu 14.04
        kernel version : 3.14.33
        xserver-xorg-video-intel : 2:2.99.911
        Display : A LCD panel(xrandr name is eDP1) and a VGA port (xrandr name is VGA1)
 
    Test Step :
     1. Open Terminal(Default output is LCD panel)
     2.Type command : 
            xrandr --output eDP1 --off --output VGA1 --mode 1920x1080
        Switch display to VGA only
     3.Type command :
            xrandr --output eDP1 --mode 1366x768 --output VGA1 --off
        Switch display to LCD panel only
     4.Repeat Step2 and Step3, sometimes, it cause VGA black screen but mouse cursor exists when using Step 2 command.
        The failure rate is 7/10
 
    Is there a way to resolve this issue?
 
Thanks.
Comment 1 Jani Nikula 2015-10-07 10:10:09 UTC 
We seem to have neglected this bug. Apologies.

If the problem persists with latest kernels, please file a bug at the freedesktop.org bugzilla [1], referencing this bug. Thank you.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
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