No support for switchable IGP/GPU
Case:
Macbook Pro 15 Retina Late 2013 uses explicitly dedicated GPU (NVIDIA
GeForce GT 750M).
Integrated graphic processor isn’t listed at all.
Result: Not being able to switch or turn off discrete card to improve battery life.
Tails version:
Tails 1.3 (Debian/Wheezy)
Desired solution:
Either:
Have Intel Iris Pro graphics processors supported by the kernel
and therefore be able to switch off the discrete one.
Or:
Be able to hardcode this solution into the kernel of Tails by myself
to use explicitly the IGP (Intel Iris Pro Graphics)
Hardware:
Macbook Pro Retina 15 Late 2013
Intel Iris Pro Graphics
NVIDIA GeForce GT 750M with 2GB of GDDR5 memory and automatic
graphics switching
Logs:
lspci -v
01:00.0 VGA compatible controller: NVIDIA Corporation Device 0fe9 (rev a1) (prog-if 00 [VGA controller])
Subsystem: Apple Inc. Device 0130
Flags: bus master, fast devsel, latency 0, IRQ 48
Memory at c0000000 (32-bit, non-prefetchable) [size=16M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
Memory at 90000000 (64-bit, prefetchable) [size=32M]
I/O ports at 1000 [size=128]
Expansion ROM at c1000000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [b4] Vendor Specific Information: Len=14 <?>
Capabilities: [100] Virtual Channel
Capabilities: [128] Power Budgeting <?>
Capabilities: [420] Advanced Error Reporting
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
Capabilities: [900] #19
Kernel driver in use: nouveau
cat /proc/version
Linux version 3.16.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.7-ckt4-3 (2015-02-03)
Notes:
There are many services like vgaswitcheroo, acpi_call etc.
However, none of them can work if the IGP (in this case Intel Iris Pro
is not listed at all - or recognized by the system?)
rant: https://wiki.archlinux.org/index.php/hybrid_graphics
Related issues
- Related to #7505 (closed)
Original created by @01 on 9089 (Redmine)