[Intel-gfx] Fast User Switching does not seem to work

[constantine]

Thank you for the reply!

> Does your Arch use systemd?
> Is your *buntu not using systemd?
Yes to both.

I am aware of the on-demand "feature" and did what you proposed (had
already done the same for half of the terminals).

After testing I noticed something more specific.
Suppose the following tty2,3 or VT:
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.

Do you think I should post to systemd for this?




constantine

On Thu, Oct 9, 2014 at 12:38 AM, constantine <costas.magnuse at gmail.com>
wrote:

> Hello all!
>
> I am encountering a peculiar problem with Fast User Switching or Kernel
> Mode Setting and I do not know how to troubleshoot it.
>
> When I run two (or more) Virtual Terminals switching between them
> (Ctrl+Alt+F2-3, etc.) takes 2+ seconds. (That is either simply initiated
> with startx from tty2 and tty3 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
>  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 but I am still
> experiencing the problem.
>
> Last, I am certain it is not a hardware related issue, because I can fast
> switch in ubuntu, but not in Arch linux.
>
>
>
> Any ideas?
>
>
>
>
> $ 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.
>
>
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