[Bug 67889] New: [Baytrail-M] Blackscreen occurred after running xrandr setting twice

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67889

          Priority: medium
            Bug ID: 67889
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Baytrail-M] Blackscreen occurred after running xrandr
                    setting twice
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: kobe.qin at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 83813
  --> https://bugs.freedesktop.org/attachment.cgi?id=83813&action=edit
dmesg for crandr_scale(drm.debug=6)

Description,
Blackscreen will occur after panel scaling via xrandr at the second time. Try
to rotate, blackscreen also will occur at the second time.

Reproduced steps,
1. Boot up system with VGA connected
2. $xinit &
3. $xrandr --output VGA1 --scale 5x5
4. $xrandr --output VGA1 --scale 10x10

Or
3. $xrandr --output VGA1 --rotate left
4. $xrandr --output VGA1 --rotate inverted

Test Environment, 

Platform: Baytrail-M 
00:00.0 Host bridge [0600]: Intel Corporation ValleyView SSA-CUnit [8086:0f00]
(rev 06)
00:02.0 VGA compatible controller [0300]: Intel Corporation ValleyView Gen7
[8086:0f31] (rev 06)

Kernel:         3.11.0rc3_nightlytop_89ff7e_20130807
Libdrm:        
(master)libdrm-2.4.46-26-g3c967e715528ee52195c178c4d09d03b643f0c06
Mesa:           (master)12522041d6e17ac176a8e86c590789bfbbe9def5
Xserver:               
(master)xorg-server-1.14.99.1-176-gf67d022523c59a27f3bf8791aa9ca6624318b1fd
Xf86_video_intel:              
(master)2.21.14-5-g6004870d53221caf05a330fcfc8a72e68b2b8898
Cairo:          (master)46d9db96d460fea72f0420102e8a90c6a7231f79
Libva:          (staging)bc49c42bcbfb24286c06b3e7cdb171b2a01c6f80
Libva_intel_driver:            
(staging)b3afeef8092dc4eb7cb73fce672ddf7a55205f34

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