Hello all! I am not sure this is the appropriate mailing list, and I have also posted to intel-...@lists.freedesktop.org (without any solution) and systemd-de...@lists.freedesktop.org Please indicate if you recommend me posting the problem to another list.
I am encountering a peculiar problem with Fast User Switching or Kernel Mode Setting and I do not know how to troubleshoot it. Suppose the following tty2,3 or VTs: 1. Ctrl+Alt+F2: logged in user in console (no X) 2. Ctrl+Alt+F3: logged in user in console (no X) 3. Ctrl+Alt+F4: logged in user in Desktop Environment (X) 4. Ctrl+Alt+F5: logged in user in Desktop Environment (X) >From 1 to 2, or 2 to 1 there is no delay. >From 1,2 to 3, or 1,2 to 4 there is no delay. >From 3,4 to 1,2 there **is** delay. >From 3 to 4, or 4 to 3, there **is**delay. In words: when I run two (or more) Virtual Terminals switching between them (Ctrl+Alt+F4-5, etc.) takes 2+ seconds. (The VTs are either simply initiated with startx from tty2 and tty3 and having only TWM, xorg-clock and xterm as their open windows OR as different displays with KDisplay Manager (kdm) in :0 and :1) I am using an intel graphics driver so I suppose KMS should be enabled by default and this seems to be the case, but there still are delays swithing between VTs. I have followed the instructions at http://carlosbecker.com/posts/how-to-enable-kms-on-i915-graphiccard-archlinux/ https://wiki.archlinux.org/index.php/kernel_mode_setting https://wiki.archlinux.org/index.php/Intel_graphics after a fresh Arch Linux installation, but I am still experiencing the problem. I am certain it is not a hardware related issue, because I can fast switch in ubuntu, but not in Arch linux. My Arch uses systemd and Ubuntu upstart. Last, I am aware of the systemd's on-demand "feature" of spawning terminals but I think it is not related to this, since I think I correctly "pre-spawned" them. How can I make switching between VTs as instantaneous as possible? PS: $ sudo cat /sys/module/i915/parameters/modeset 1 ### Note: ### Before starting the "process" of enabling KMS (which I suppose it should be enabled in the first place, right?) this value was: -1 $ uname -a Linux myhostname 3.16.4-1-ARCH #1 SMP PREEMPT Mon Oct 6 08:22:27 CEST 2014 x86_64 GNU/Linux $ lsmod | grep -e drm -e 915 -e kms crc32_pclmul 12915 0 scsi_mod 142915 4 uas,usb_storage,libata,sd_mod i915 864879 8 button 12909 1 i915 i2c_algo_bit 12744 1 i915 video 17995 1 i915 drm_kms_helper 49262 1 i915 drm 258005 10 i915,drm_kms_helper i2c_core 50152 5 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit intel_gtt 17848 2 i915,intel_agp $ sudo lspci -vvnn | head -28 | tail -21 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller]) Subsystem: ASRock Incorporation Device [1849:0152] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 40 Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M] Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M] Region 4: I/O ports at f000 [size=64] Expansion ROM at <unassigned> [disabled] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Address: fee0f00c Data: 4181 Capabilities: [d0] Power Management version 2 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Capabilities: [a4] PCI Advanced Features AFCap: TP+ FLR+ AFCtrl: FLR- AFStatus: TP- Kernel driver in use: i915 Kernel modules: i915 $ head -10 /var/log/Xorg.0.log [ 4.919] X.Org X Server 1.16.1 Release Date: 2014-09-21 [ 4.919] X Protocol Version 11, Revision 0 [ 4.919] Build Operating System: Linux 3.16.1-1-ARCH x86_64 [ 4.919] Current Operating System: Linux myhostname 3.16.4-1-ARCH #1 SMP PREEMPT Mon Oct 6 08:22:27 CEST 2014 x86_64 [ 4.919] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=af9a90ee-5db2-4abf-b8be-006a65e9f09e rw quiet video=SVIDEO-1:d [ 4.920] Build Date: 21 September 2014 10:53:13AM [ 4.920] [ 4.920] Current version of pixman: 0.32.6 ### Note: ### As kernel parameters I have also tried video=SVIDEO-1:d, i915.modeset=1, and nothing, but neither works.
