Hello, All is said. I had more Xorg freeze, but now only Firefox is a linux-nouveau issue : Here is dmesg | grep nouveau : [ 0.602330] nouveau [ DEVICE][0000:01:00.0] BOOT0 : 0x0c8000a1 [ 0.602334] nouveau [ DEVICE][0000:01:00.0] Chipset: GF110 (NVC8) [ 0.602335] nouveau [ DEVICE][0000:01:00.0] Family : NVC0 [ 0.603514] nouveau [ VBIOS][0000:01:00.0] checking PRAMIN for image... [ 0.703194] nouveau [ VBIOS][0000:01:00.0] ... appears to be valid [ 0.703195] nouveau [ VBIOS][0000:01:00.0] using image from PRAMIN [ 0.703270] nouveau [ VBIOS][0000:01:00.0] BIT signature found [ 0.703271] nouveau [ VBIOS][0000:01:00.0] version 70.10.17.00 [ 0.703483] nouveau [ MXM][0000:01:00.0] no VBIOS data, nothing to do [ 0.725588] nouveau [ PFB][0000:01:00.0] RAM type: GDDR5 [ 0.725590] nouveau [ PFB][0000:01:00.0] RAM size: 1536 MiB [ 0.739861] nouveau [ DRM] VRAM: 1536MiB [ 0.739862] nouveau [ DRM] GART: 512MiB [ 0.739866] nouveau [ DRM] BIT BIOS found [ 0.739868] nouveau [ DRM] Bios version 70.10.17.00 [ 0.739871] nouveau [ DRM] TMDS table version 2.0 [ 0.739873] nouveau [ DRM] DCB version 4.0 [ 0.739876] nouveau [ DRM] DCB outp 00: 02000300 00000000 [ 0.739878] nouveau [ DRM] DCB outp 01: 01000302 00020030 [ 0.739880] nouveau [ DRM] DCB outp 02: 04011380 00000000 [ 0.739882] nouveau [ DRM] DCB outp 03: 08011382 00020030 [ 0.739884] nouveau [ DRM] DCB outp 04: 02022362 00020010 [ 0.739886] nouveau [ DRM] DCB conn 00: 00001030 [ 0.739889] nouveau [ DRM] DCB conn 01: 00010130 [ 0.739891] nouveau [ DRM] DCB conn 02: 00002261 [ 0.777687] nouveau [ DRM] 0 available performance level(s) [ 0.777689] nouveau [ DRM] c: core 50MHz shader 101MHz memory 135MHz voltage 963mV fanspeed 40% [ 0.790243] nouveau [ DRM] MM: using COPY0 for buffer copies [ 1.072052] nouveau [ DRM] allocated 1920x1200 fb: 0x60000, bo ffff88031fb3b400 [ 1.072215] fbcon: nouveaufb (fb0) is primary device [ 1.112738] fb0: nouveaufb frame buffer device [ 1.112741] [drm] Initialized nouveau 1.1.0 20120801 for 0000:01:00.0 on minor 0 [ 1.112752] nouveau 0000:02:00.0: enabling device (0004 -> 0007) [ 1.113197] nouveau [ DEVICE][0000:02:00.0] BOOT0 : 0x0c8000a1 [ 1.113203] nouveau [ DEVICE][0000:02:00.0] Chipset: GF110 (NVC8) [ 1.113204] nouveau [ DEVICE][0000:02:00.0] Family : NVC0 [ 1.114061] nouveau [ VBIOS][0000:02:00.0] checking PRAMIN for image... [ 1.123781] nouveau [ VBIOS][0000:02:00.0] ... signature not found [ 1.123783] nouveau [ VBIOS][0000:02:00.0] checking PROM for image... [ 1.383381] nouveau [ VBIOS][0000:02:00.0] ... appears to be valid [ 1.383382] nouveau [ VBIOS][0000:02:00.0] using image from PROM [ 1.383460] nouveau [ VBIOS][0000:02:00.0] BIT signature found [ 1.383462] nouveau [ VBIOS][0000:02:00.0] version 70.10.17.00 [ 1.383762] nouveau [ MXM][0000:02:00.0] no VBIOS data, nothing to do [ 1.383776] nouveau [ DEVINIT][0000:02:00.0] adaptor not initialised [ 1.383777] nouveau [ VBIOS][0000:02:00.0] running init tables [ 1.493277] nouveau [ PFB][0000:02:00.0] RAM type: GDDR5 [ 1.493278] nouveau [ PFB][0000:02:00.0] RAM size: 1536 MiB [ 1.507206] nouveau [ DRM] VRAM: 1536MiB [ 1.507207] nouveau [ DRM] GART: 512MiB [ 1.507208] nouveau [ DRM] BIT BIOS found [ 1.507210] nouveau [ DRM] Bios version 70.10.17.00 [ 1.507211] nouveau [ DRM] TMDS table version 2.0 [ 1.507212] nouveau [ DRM] DCB version 4.0 [ 1.507213] nouveau [ DRM] DCB outp 00: 02000300 00000000 [ 1.507214] nouveau [ DRM] DCB outp 01: 01000302 00020030 [ 1.507215] nouveau [ DRM] DCB outp 02: 04011380 00000000 [ 1.507216] nouveau [ DRM] DCB outp 03: 08011382 00020030 [ 1.507217] nouveau [ DRM] DCB outp 04: 02022362 00020010 [ 1.507218] nouveau [ DRM] DCB conn 00: 00001030 [ 1.507219] nouveau [ DRM] DCB conn 01: 00010130 [ 1.507220] nouveau [ DRM] DCB conn 02: 00002261 [ 1.514491] nouveau [ DRM] 0 available performance level(s) [ 1.514493] nouveau [ DRM] c: core 50MHz shader 101MHz memory 135MHz voltage 963mV fanspeed 40% [ 1.527248] nouveau [ DRM] MM: using COPY0 for buffer copies [ 1.825805] nouveau [ DRM] allocated 1024x768 fb: 0x60000, bo ffff88031ec03800 [ 1.825960] fb1: nouveaufb frame buffer device [ 1.825965] [drm] Initialized nouveau 1.1.0 20120801 for 0000:02:00.0 on minor 1 [ 257.520077] nouveau W[ PFIFO][0000:01:00.0] unknown status 0x40000000 [ 324.410050] nouveau W[ PFIFO][0000:01:00.0] unknown status 0x40000000 [ 338.895490] nouveau E[ PFIFO][0000:01:00.0] read fault at 0x0000000000 [PAGE_NOT_PRESENT] from PGRAPH/CTXCTL on channel 0x005fcbb000 [ 338.895495] nouveau W[ PFIFO][0000:01:00.0] unknown status 0x40000000 [ 422.276435] nouveau E[ DRM] GPU lockup - switching to software fbcon [ 425.277136] nouveau E[ 595] failed to idle channel 0xcccc0001 [ 427.276437] nouveau E[ PFIFO][0000:01:00.0] channel 2 kick timeout [ 427.277739] nouveau [ PFIFO][0000:01:00.0] unknown status 0x00000100 [ 429.275787] nouveau E[ PFIFO][0000:01:00.0] playlist update failed [ 429.276987] nouveau ![ PFIFO][0000:01:00.0] unhandled status 0x00000001 [ 432.273549] nouveau E[ 595] failed to idle channel 0xcccc0000 [ 434.272829] nouveau E[ PFIFO][0000:01:00.0] channel 1 kick timeout [ 436.272182] nouveau E[ PFIFO][0000:01:00.0] playlist update failed [ 439.276654] nouveau E[ 1194] failed to idle channel 0xcccc0000 [ 441.274744] nouveau E[ PFIFO][0000:01:00.0] channel 3 kick timeout [ 443.272903] nouveau E[ PFIFO][0000:01:00.0] playlist update failed