[Bug 37528] New: vgaswitcheroo unable to switch to radeon from intel GPU: cannot find crtc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37528

           Summary: vgaswitcheroo unable to switch to radeon from intel
                    GPU: cannot find crtc
           Product: xorg
           Version: 7.6
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: eruditehermit at yahoo.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=47090)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=47090)
dmesg before echo DDIS > switch

When I try to switch to my radeon HD 6630 discrete GPU on my sandybridge Sony
VAIO VPCSB from intel integrated GPU, I get a segmentation fault in X and even
VT output to screen stops. When I ssh in from another computer and switch back
to the intel GPU, my screen comes back and I can restart X and log in again.

Steps I performed to produce this:
1) make sure both intel and radeon kernel modules are loaded
2) echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch
3) log out of X. At this point the screen is unresponsive and I cannot use the
machine or log into X because it has segfaulted
4) ssh in from another computer
5) echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch
7) switch to VT1 of first computer
8) login and type: sudo service gdm restart from first computer
9) log back into X on first computer

-- 
Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.