Moreover, I have following lines in xorg.log

        Warning intel(0): Register 0x61200 (PP_STATUS) changed from 0xc0000008 
to 0xd0000009
        Warning intel(0): PP_STATUS before: on, ready, sequencing idle
        Warning intel(0): PP_STATUS after: on, ready, sequencing on
        Warning intel(0): Register 0x70024 (PIPEASTAT) changed from 0x00000000 
to 0x80000207
        Warning intel(0): PIPEASTAT before: status:
        Warning intel(0): PIPEASTAT after: status: FIFO_UNDERRUN 
VSYNC_INT_STATUS SVBLANK_INT_STATUS VBLANK_INT_STATUS OREG_UPDATE_STATUS
        Warning intel(0): Register 0x71024 (PIPEBSTAT) changed from 0x00000206 
to 0x80000206
        Warning intel(0): PIPEBSTAT before: status: VSYNC_INT_STATUS 
SVBLANK_INT_STATUS VBLANK_INT_STATUS
        Warning intel(0): PIPEBSTAT after: status: FIFO_UNDERRUN 
VSYNC_INT_STATUS SVBLANK_INT_STATUS VBLANK_INT_STATUS
        Warning intel(0): DRI2 requires UXA
        Warning intel(0): ESR is 0x00000001
        Warning intel(0): Existing errors found in hardware state.

-- 
[i965gm] Corrupted X after enabling UXA, unable to log into KDE (UXA bug)
https://bugs.launchpad.net/bugs/364479
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