[Bug 60523] Radeon DPM not working with 2 monitors attached to Radeon HD5770 (Juniper)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60523

--- Comment #75 from Steven Haigh <netwiz at crc.id.au> ---
To get more info on this, I rebooted the system with a single screen attached:

$ cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 0    sclk: 30000 mclk: 30000 vddc: 950 vddci: 950

Plugged in the second DVI cable & KDE automatically configured the second
screen for me:

$ cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 0    sclk: 30000 mclk: 105000 vddc: 950 vddci: 1150

Plugged in the third screen to the DP - which KDE automatically configured
again:

$ cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 0    sclk: 30000 mclk: 105000 vddc: 950 vddci: 1150

This is good.

Yet if I boot the system with three screens attached, I'm stuck at:

$ cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 2    sclk: 90000 mclk: 105000 vddc: 1175 vddci: 1150

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