Comment # 20
on bug 63935
from Benjamin Lee
I am using a monolithic kernel without initrd (CONFIG_DRM_RADEON=y and CONFIG_EXTRA_FIRMWARE) using the exact same vmlinuz file between EFI and BIOS modes, so I don't believe I have a ucode issue since BIOS mode works correctly. RADEON_AUX_SC_CNTL is different between EFI and BIOS emulation: blee@supra ~/tmp $ diff bios.regs efi.regs 8c8 < RADEON_AUX_SC_CNTL 52f7377c --- > RADEON_AUX_SC_CNTL 52f7337c 46,48c46,48 < RADEON_CRTC2_H_TOTAL_DISP 0200000f < RADEON_CRTC2_H_SYNC_STRT_WID 00000000 < RADEON_CRTC2_V_TOTAL_DISP 00000100 --- > RADEON_CRTC2_H_TOTAL_DISP 0000000f > RADEON_CRTC2_H_SYNC_STRT_WID 00003f3f > RADEON_CRTC2_V_TOTAL_DISP 00000000 I built a separate kernel for fglrx and found that RADEON_AUX_SC_CNTL matched the BIOS emulation mode: blee@supra ~/tmp $ diff fglrx.regs bios.regs 46c46 < RADEON_CRTC2_H_TOTAL_DISP 0203000f --- > RADEON_CRTC2_H_TOTAL_DISP 0200000f
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