[Bug 100222] Hang regression with R7 M370, identified possible culprit commit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100222

            Bug ID: 100222
           Summary: Hang regression with R7 M370, identified possible
                    culprit commit
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: registo.mailling at gmail.com

Created attachment 130246
  --> https://bugs.freedesktop.org/attachment.cgi?id=130246&action=edit
lspci -nnk and dmesg output

After updating from kernel 4.9 series to 4.10 series I have identified a
regression when using the discrete GPU on my laptop (Lenovo Thinkpad E560).

When running any demanding application with DRI_PRIME=1 the card will hang, one
example would be running 'DRI_PRIME=1 glmark2 -b texture'.

I have noticed that the content of /sys/kernel/debug/dri/1/radeon_pm_info has
changed between kernel 4.9 and 4.10 when running glmark2.

With 4.9:
power level 4    sclk: 75000 mclk: 80000 vddc: 1050 vddci: 0 pcie gen: 2

With 4.10:
power level 4    sclk: 87500 mclk: 90000 vddc: 1050 vddci: 0 pcie gen: 2

This led me to revert commit 3a69adfe5617ceba04ad3cff0f9ccad470503fb2 which
prevents the card from hanging.

You can find the output of lspci and dmesg in the attachment for the case with
commit 3a69adfe5617ceba04ad3cff0f9ccad470503fb2 reverted.

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