[Bug 90037] [xen iommu] After upgrading to Linux 3.19, desktop no longer works in Xen 4.5.0 dom0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90037

--- Comment #27 from Ting-Wei Lan <lantw44 at gmail.com> ---
(In reply to Lakshmi from comment #26)
> (In reply to Ting-Wei Lan from comment #23)
> > (In reply to Lakshmi from comment #22)
> > > Ting, sorry for the delay.
> > > 
> > > Do you still have the issue?
> > > If so, try to reproduce the issue using drm-tip
> > > (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e
> > > log_buf_len=4M, and if the problem persists attach the full dmesg from boot.
> > > 
> > > This will speed up the investigation.
> > 
> > Yes, the problem still exists. I could reproduce it with drm-tip commit
> > 6dc8457a2f2093eecb9c6cbb7306fd25bb1664e6. I tested two times and the results
> > were similar: all characters are broken and the system was unable to show
> > GDM login screen. The system was accessible from SSH but it couldn't reboot.
> > I ended up pressing 'R' on the Xen hypervisor console to reboot it.
> 
> How often you see this issue? Every time you reboot?

Yes, it happens on every boot unless I pass iommu=no-igfx to Xen command line.

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