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I'm having trouble getting Jessie to use the integrated graphics on a Celeron N3050 (Braswell).

I've tried installing xserver-xorg-video-intel from jessie-backports but this doesn't help.

glxinfo | grep "OpenGL" output:

OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.5, 128 bits)
OpenGL version string: 3.0 Mesa 10.3.2
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:

lspci -vnn output:

00:00.0 Host bridge [0600]: Intel Corporation Device [8086:2280] (rev 21)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, fast devsel, latency 0
    Kernel driver in use: iosf_mbi_pci

00:02.0 VGA compatible controller [0300]: Intel Corporation Device      [8086:22b1] (rev 21) (prog-if 00 [VGA controller])
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, fast devsel, latency 0, IRQ 7
    Memory at 90000000 (64-bit, non-prefetchable) [size=16M]
    Memory at 80000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 2000 [size=64]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: <access denied>

00:0b.0 Signal processing controller [1180]: Intel Corporation Device [8086:22dc] (rev 21)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, fast devsel, latency 0, IRQ 10
    Memory at 91514000 (64-bit, non-prefetchable) [size=4K]
    Capabilities: <access denied>

00:13.0 SATA controller [0106]: Intel Corporation Device [8086:22a3] (rev 21) (prog-if 01 [AHCI 1.0])
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 131
    I/O ports at 2060 [size=32]
    Memory at 91515000 (32-bit, non-prefetchable) [size=2K]
    Capabilities: <access denied>
    Kernel driver in use: ahci

00:14.0 USB controller [0c03]: Intel Corporation Device [8086:22b5] (rev 21) (prog-if 30 [XHCI])
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, medium devsel, latency 0, IRQ 133
    Memory at 91500000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: <access denied>
    Kernel driver in use: xhci_hcd

00:1a.0 Encryption controller [1080]: Intel Corporation Device [8086:2298] (rev 21)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, fast devsel, latency 0, IRQ 10
    Memory at 91400000 (32-bit, non-prefetchable) [size=1M]
    Memory at 91300000 (32-bit, non-prefetchable) [size=1M]
    Capabilities: <access denied>

00:1b.0 Audio device [0403]: Intel Corporation Device [8086:2284] (rev 21)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, fast devsel, latency 0, IRQ 134
    Memory at 91510000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: snd_hda_intel

00:1c.0 PCI bridge [0604]: Intel Corporation Device [8086:22c8] (rev 21) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
    I/O behind bridge: 00003000-00003fff
    Memory behind bridge: 91600000-917fffff
    Prefetchable memory behind bridge: 0000000091800000-00000000919fffff
    Capabilities: <access denied>
    Kernel driver in use: pcieport

00:1c.2 PCI bridge [0604]: Intel Corporation Device [8086:22cc] (rev 21) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
    Memory behind bridge: 91200000-912fffff
    Capabilities: <access denied>
    Kernel driver in use: pcieport

00:1c.3 PCI bridge [0604]: Intel Corporation Device [8086:22ce] (rev 21) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
    I/O behind bridge: 00001000-00001fff
    Memory behind bridge: 91100000-911fffff
    Prefetchable memory behind bridge: 0000000091000000-00000000910fffff
    Capabilities: <access denied>
    Kernel driver in use: pcieport

00:1f.0 ISA bridge [0601]: Intel Corporation Device [8086:229c] (rev 21)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, medium devsel, latency 0
    Capabilities: <access denied>

00:1f.3 SMBus [0c05]: Intel Corporation Device [8086:2292] (rev 21)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: medium devsel, IRQ 7
    Memory at 91516000 (32-bit, non-prefetchable) [size=32]
    I/O ports at 2040 [size=32]
    Capabilities: <access denied>

02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Hewlett-Packard Company Device [103c:804a]
    Flags: bus master, fast devsel, latency 0, IRQ 18
    Memory at 91200000 (64-bit, non-prefetchable) [size=32K]
    Capabilities: <access denied>
    Kernel driver in use: wl

03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 07)
    Subsystem: Hewlett-Packard Company Device [103c:80c5]
    Flags: bus master, fast devsel, latency 0, IRQ 132
    I/O ports at 1000 [size=256]
    Memory at 91100000 (64-bit, non-prefetchable) [size=4K]
    Memory at 91000000 (64-bit, prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: r8169

The root issue I'm having is that xrandr can't identify the gamma, and thus can't set the output device parameters (the one that I'm mainly interested in is brightness).

1

Having just come across the problem myself (same issues, similar hardware and outputs you quote here), I struggled with a variety of tweaks and Xorg configs with no luck until I found that the only fix that worked for me was updating my kernel from 3.16 to 4.9 through the Jessie backports:

sudo apt-get -t jessie-backports install linux-image-4.9.0-0.bpo.2-amd64

In my troubleshooting, having returned the same error from glxgears as found in this SE question, I tried the libraries suggested in the 2nd solution which fixed the 3D graphics errors alone, but to get full controll over the display and return functionality to xrandr, xbacklight, etc, the kernel upgrade was necessary. Display/backlight associated things worked out of the box from there, including backlight media keys.

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